In his small 1950s council house the 14-year-old Liverpool schoolboy had persevered with learning the trumpet.He tirelessly practised his C scale on the instrument, a birthday gift from his father, but he wanted to sing and play at the same time and decided that what he really needed was a guitar.Fortunately for Paul McCartney, his father had bought the trumpet from Rushworth's, a Liverpool store that was then Europe's largest music house, and somewhere that would allow him to exchange the instrument for a £25 German guitar."The story goes that he couldn't play it because he was left handed so he had to turn the strings round the other way", Jonathan Rushworth, great-great grandson of Rushworth's founder recalls.